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pmdomain: qcom: rpmhpd: Skip retention level for Power Domains

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In the cases where the power domain connected to logics is allowed to
transition from a level(L)-->power collapse(0)-->retention(1) or
vice versa retention(1)-->power collapse(0)-->level(L)  will cause the
logic to lose the configurations. The ARC does not support retention
to collapse transition on MxC rails.

The targets from SM8450 onwards the PLL logics of clock controllers are
connected to MxC rails and the recommended configurations are carried
out during the clock controller probes. The MxC transition as mentioned
above should be skipped to ensure the PLL settings are intact across
clock controller power on & off.

On older targets that do not split MX into MxA and MxC does not collapse
the logic and it is parked always at RETENTION, thus this issue is never
observed on those targets.

Cc: stable@vger.kernel.org # v5.17
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Taniya Das <quic_tdas@quicinc.com>
Link: https://lore.kernel.org/r/20240625-avoid_mxc_retention-v2-1-af9c2f549a5f@quicinc.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Taniya Das 2024-06-25 10:03:11 +05:30 committed by Ulf Hansson
parent c3f38fa61a
commit ddab91f4b2
1 changed files with 7 additions and 0 deletions
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7
drivers/pmdomain/qcom/rpmhpd.c
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@ -40,6 +40,7 @@
* @addr: Resource address as looped up using resource name from
* cmd-db
* @state_synced: Indicator that sync_state has been invoked for the rpmhpd resource
* @skip_retention_level: Indicate that retention level should not be used for the power domain
*/
struct rpmhpd {
struct device *dev;
@ -56,6 +57,7 @@ struct rpmhpd {
const char *res_name;
u32 addr;
bool state_synced;
bool skip_retention_level;
};
struct rpmhpd_desc {
@ -173,6 +175,7 @@ static struct rpmhpd mxc = {
.pd = { .name = "mxc", },
.peer = &mxc_ao,
.res_name = "mxc.lvl",
.skip_retention_level = true,
};
static struct rpmhpd mxc_ao = {
@ -180,6 +183,7 @@ static struct rpmhpd mxc_ao = {
.active_only = true,
.peer = &mxc,
.res_name = "mxc.lvl",
.skip_retention_level = true,
};
static struct rpmhpd nsp = {
@ -819,6 +823,9 @@ static int rpmhpd_update_level_mapping(struct rpmhpd *rpmhpd)
return -EINVAL;
for (i = 0; i < rpmhpd->level_count; i++) {
if (rpmhpd->skip_retention_level && buf[i] == RPMH_REGULATOR_LEVEL_RETENTION)
continue;
rpmhpd->level[i] = buf[i];
/* Remember the first corner with non-zero level */